Title: This plugin is causing a HTML Error 500
Last modified: June 15, 2017
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# This plugin is causing a HTML Error 500
* [milesawe](https://wordpress.org/support/users/milesawe/)
* (@milesawe)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/)
* This plugin is causing a HTML Error 500 whenever I activate it on my plugins
page my website does not work anymore and I have to go into the files and rename
this plugin and it fixes the problem. I would like to have this plugin included
onto my website but I cannot with this error. I have WP 4.8 installed on my website.
I have other plugins included on my website, I deactivated the ones that might
be causing the problem with this plugin and tried enabling this plugin again
but still no use.
Please Help.
Viewing 7 replies - 1 through 7 (of 7 total)
* Plugin Author [Roland Barker](https://wordpress.org/support/users/xnau/)
* (@xnau)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9232253)
* There are a lot of different ways a 500 could come up. I’d suggest you first
delete the plugin and reinstall from a fresh copy in case there was some problem
with the files. Also, there will be an error message somewhere that indicates
what happened…you may want to ask your web host to take a look.
* What is your PHP version?
* Thread Starter [milesawe](https://wordpress.org/support/users/milesawe/)
* (@milesawe)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9232292)
* I have PHP version 5.4.43 installed on my website.
* Thread Starter [milesawe](https://wordpress.org/support/users/milesawe/)
* (@milesawe)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9232305)
* This is the error message that I get: The plugin participants-database/participants-
database.php has been deactivated due to an error: Plugin file does not exist.
* Thread Starter [milesawe](https://wordpress.org/support/users/milesawe/)
* (@milesawe)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9232308)
* Thank you for your response.
* Plugin Author [Roland Barker](https://wordpress.org/support/users/xnau/)
* (@xnau)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9232661)
* OK, but that is not the error that is causing the 500…that is what you get when
you rename the folder. What you need to do is perform a fresh install of the
plugin, and if you get the 500 error again, that is when you need to look for
the error message.
* Thread Starter [milesawe](https://wordpress.org/support/users/milesawe/)
* (@milesawe)
* [8 years, 12 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9232705)
* I just read another post to this forum titled: Fatal error: Call to a member
function get() on null in …/query.php on line 28
And I do also have Events Manager
Pro and think that is their plugin causing the problem not yours, I am going
to try to contact them and see if they know whats causing the issue.
* [milord85](https://wordpress.org/support/users/milord85/)
* (@milord85)
* [8 years, 11 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9253823)
* i confirm that Participants Database and Events Manager Pro are not compatible
due to a payment gateway callback function error.
Viewing 7 replies - 1 through 7 (of 7 total)
The topic ‘This plugin is causing a HTML Error 500’ is closed to new replies.
* 
* [Participants Database](https://wordpress.org/plugins/participants-database/)
* [Frequently Asked Questions](https://wordpress.org/plugins/participants-database/#faq)
* [Support Threads](https://wordpress.org/support/plugin/participants-database/)
* [Active Topics](https://wordpress.org/support/plugin/participants-database/active/)
* [Unresolved Topics](https://wordpress.org/support/plugin/participants-database/unresolved/)
* [Reviews](https://wordpress.org/support/plugin/participants-database/reviews/)
* 7 replies
* 3 participants
* Last reply from: [milord85](https://wordpress.org/support/users/milord85/)
* Last activity: [8 years, 11 months ago](https://wordpress.org/support/topic/this-plugin-is-causing-a-html-error-500/#post-9253823)
* Status: not resolved